system
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Thanks redwolfe- that’s reassuring- you’re saying what I sort of suspected. I don’t know for sure what I would have had to do to execute it- double click and select run if it was a normal file?- which I may have double clicked, but nothing appeared to happen and I definitely didn’t “run” it.
Secondly on my PC zipped files automatically unzip- on my laptop they don’t and I didn’t unzip it.
I thought the CALMAIN.exe was probably a false positive- it was just its detection came straight after clicking on the dodgy file so I wondered if it was a virus as those program files have been there for a year plus and AVAST has never detected them before.
So I’m thinking as I never unzipped the file and my laptop can’t unzip- it must be ok and the detected infection at CAMAIN.exe was just a coincidence. I was just a bit nervous as I didn’t know if the attached Malware could be designed to load up automatically. Mostly due to my lack of knowledge! 
To be on safe side have run scans and here are my results- please let me know what you think thanks!